<div ng-init="initWidget()">
  <div class="btn-bottom" id="scroller">
    <button type="button" class="btn btn-default btn-circle" uib-tooltip="回到顶部">
        <i class="glyphicon glyphicon-chevron-up"></i></button>
  </div>
  <div class="flyover" ng-show="loading">
    <div class="loading-mask"></div>
    <div class="loading-panel">
      <div class="loading-body"><img alt="Loading" ng-src="imgs/loading.gif"> Loading...</div>
    </div>
  </div>
</div>